Harmonic distortion in slip sweep records

Ras, Paul; Daly, M. C.; Baeten, G.

doi:10.1190/1.1821095

Cited by 5 publications

(1 citation statement)

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“…In addition, the air bags act as a low-pass filter and the intrinsic nonlinearity of mechanics and hydraulics behind hydraulic vibrators and baseplate-ground coupling results in harmonic distortion causing detrimental effects such as harmonic noise, loss of energy and ghost events in the data. With recent increased interest in low frequencies and broadband seismic data acquisition (Denis et al, 2013;ten Kroode et al, 2013;Brittan and Jones, 2019;Cordery, 2020), even with the improvements made (Dean et al, 2016;Ras et al, 1999;Bagaini, 2008;Wei et al, 2010;Meunier, 2011;Wei and Phillips, 2013;Bagaini et al, 2014), maintaining broadband signal excitation over a wide bandwidth at a constant drive level and with minimal harmonic distortion remains challenging for hydraulic vibrators.…”

Section: Introductionmentioning

confidence: 99%

Seismic imaging using an e-vib — A case study analyzing the signal properties of a seismic vibrator driven by electric linear synchronous motors

Brodic

Ras²,

Kunder³

et al. 2021

GEOPHYSICS

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Seismic imaging characteristics of a prototype electrically driven, linear synchronous motor (LSM) based, vertical-force seismic vibrator (“e-vib”) were evaluated at a site in the Netherlands. The system weighs 1.65 t and excites seismic signals with a peak force of 6.7 kN. Data were recorded along two collocated geophone based-nodal and landstreamer MEMS-based (micro-electromechanical sensors) 2D seismic profiles. To obtain a broad bandwidth dataset, the e-vib operated with a 1-200 Hz linear sweep. Shot gathers of the merged nodal-landstreamer dataset show good quality seismic data of a broadband nature. The processed merged dataset demonstrates high-resolution reflections of the stratigraphic members from approximately 200 m to 2 km, with visible reflections as deep as 2.5 to 2.9 km. As a reference, we also processed a legacy 3D microspread dataset acquired at the same site with a magnitude stronger (14.1 t, 67.5 kN) hydraulic vibrator. Comparison of our nodal-landstreamer seismic section versus 2D slices extracted from the processed microspread volume suggests similar signal penetration depth and same key marker horizons seen in both. Analysis of the reaction mass and base-plate accelerometer signals recorded with the e-vib source operating both on grass and asphalt surfaces shows that the e-vib has low total harmonic distortion. The results obtained indicate that, although relatively small, the e-vib is capable of generating high-quality, broadband seismic data.

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